Backlight Keyboard won't light up...

My backlight keyboard won't light up. I don't think the lighting is damaged at all, i didn't spill anything.. but when i press on the F6 button to light it up, it shows the thing on the screen but the white bars won't fill up and apparently it can't light up. I didn't do anything to any settings, so what is the problem?? Can anyone tell me?Thanks

Something must be wrong with the setting or w/e but see, I've tried everything with the setting, i've looked into everything and i've tried resetting SMC and then PRAM but it just won't work!! not that i use backlight much, but it's obvious that there's something wrong with this machine so im a little worried...

could it be caused by any software i've installed? although i don't see how that's possible since none of them have anything to do with my keyboard...

you know i have the same problem and i can't get it back either. i was messing around with some hot keys when mine stopped lighting up lol. i think some how we accidently locked the keys or something... i'm try to search for some answers to cuz i LOVED my backlighting u_u if you find an answer let me know. visa versa.

i've recently fixed the problem.. i toggled settings and put them back to default ( the keyboard ones) and i put it in the dark and all the sudden the backlight came back. i was happy! and then i pushed the backlight key on my keyboard and it allowed me to brighten and dim it.

so i'm not to sure what EXACTLY fixed it but it worked!so maybe you could try doing that.

kind of vague, but who knows. i hope this helps someone. cuz i know how much i like to brag about my keyboard backlight =]

thanks everyone, i fixed the problem!!well.. actually it got fixed by itself... i dont know what the problem was, but i had the problem one more time when i was on battery power. i think it has something to do with the power.. whether it's on battery power or AC. Thank you

Having the exact same problem here. Getting the crossed out circle. Tried doing the Mac OS Software Update, but still the same after update and reboot.The keyboard lights up when I use the "Lab Tick" software, but one shouldn't have to uninstall 3rd party software to fix an OS/HW bug.***?

ok, so i was having this same problem. but i was messing around with the buttons, and i figured out that if you toggle the F1 and F2 buttons while toggling the keyboard lighting buttons, it will light up.i was getting the same exact things. I know this is definitely a solution because i did it, and it worked, and 5 mins later, my keyboard lighting buttons didn't work, so i did it again and it worked.

Just to follow up, what was wrong with the previous one was that the built-in camera wasn't working so that they keyboard algorithm read that as "it's too bright" and refused to turn on the keyboard lighting. The USB controller was actually bad, i think as there was no Bluetooth receiver detected on the USB tree. Got a replacement and new machine works great.

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